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Lewisia is a plant genus, named for Meriwether Lewis who encountered the species in 1806. The native habitat of Lewisia species is north facing cliffs in the western part of North America.eriwether Lewis is credited with the first discovery by a European or American of Lewisia, which was known to the local Native Americans as bitterroot. Lewis discovered the specimen in 1806 at Lolo Creek, in the mountain range that became known as the Bitterroot Mountains.
Costia. Costia is a ciliated protozoan that can kill great numbers of fish in a very short time just like Chilodonilla. It can be active in cold water down to 45 degrees Fahrenheit. Small numbers of Costia are not uncommon and appear not be detrimental to the fishâs health.In small numbers these parasites seem to live on cellular debris in a commensalistic relationship with their fish host. It becomes a serious threat when, for various reasons, the parasite becomes established in large numbers.mall numbers of Costia are not uncommon and appear not be detrimental to the fishâs health. In small numbers these parasites seem to live on cellular debris in a commensalistic relationship with their fish host. It becomes a serious threat when, for various reasons, the parasite becomes established in large numbers.